MLA

Van Vechten, Carl, 1880-1964. Balmain, Pierre. Box 333, folder 4177. 1947 November 9. https://collections.library.yale.edu/catalog/2030274.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 333, folder 4177"])(1947 November 9)[Balmain, Pierre]. https://collections.library.yale.edu/catalog/2030274.